EPA-EAD: Method 1632: Chemical Speciation of Arsenic in Water and Tissue
|Brief Method Summary:||After collection, an aliquot of water sample or tissue digestate is placed in a specially designed reaction vessel to which 6M HCl is added, followed by the addition of 4% NaBH4. Arsines are purged from the sample onto a cooled glass trap where they are then thermally desorbed into an inert gas stream that carries them into an atomic absorption spectrophotometer for detection.|
|Scope And Application:||This method determines inorganic arsenic (IA), arsenite (Ar+3), arsenate (As+5), monomethylarsonic acid (MMA), and dimethylarsinic (DMA) in filtered and unfiltered water and in tissue.|
|Applicable Conc Range:||0.01-50 ug/L in water.|
0.10-500 ug/g dry weight of tissue.